This is the FlightGear Aircraft Collection for all platforms. It contains the complete set of 500+ aircraft available for FlightGear 2018.2. Each aircraft is packaged as an individual .zip file so you can pick and choose which aircraft you would like to install. Easy install instructions are available on the FlightGear wiki: http://wiki.flightgear.org/Howto:Install_aircraft
You can see the complete list of aircraft included on this package at the FlightGear Aircraft Download Page.